Valve



I of valves and particularly to a. valve liar-' ing a novel stem bush ng'adapted to act as Patented June 7,1927. a

' a TU E TAT rR'EnERIoK HJHE E'MAN CFCINCILl'lVATIj onto, ASSIGVNORY TOthe ma nesia me ."ooMPANYQonci toinimrr, 01110; CORPORATION or 01:110.;2

' "VALVE,

Application filed January 192s, ser al No. 83,513.

My invention relates to the general class an auxiliary closing meanscooperating with the stem of the alve for tightly't'orcing the valve.into engagement with its seat.

' It 15 the ob ect of my invention to provlde a valve hav ng a bushingwh ch may, by'the ad usting' effectvo't the securing'jmeans with whichthe bushing 1s'secured to the l'aody'ol thevalve, act asanauxiliarymeans to force the closing'element Ottheval ve againsttheseat andthesecuring means acts as a means for controlling therextent 0t slidablemovement of said bushing. Broad- ]ly'n'n'y invention has for its o bjectthelp'rovision of a valve for high pressurework which will have anvimproved 'lIlBCl'lEll'llSlll tor closing 'thevalve cooperating with thestem on which the valveclosing elem-entwis mou ted. W Stop valves andnon-return valves have valve disc which is'rnounted on a stem whichextends V out through a yoke. A handwheelis pro.- vided for the stem andth'estem is'threaded through a bushingpermanently mountedrin the yoke?The'only means of tightening'thc valve or closing it, is bywturningthehands wheelwith or without such additional torque aslm'ay 'bevapplied bynea-nsof -ZLIWI'Q11C11. Vltll handwheels, even if wrenches are usedonfthemfit' isimpossible'to'close the valve be provided which may heclosed tightly.

As most boilers are in series withpipe lines leading to steam mains andas each boiler must be adapted to be cut off from the main for cleaning,or necessary repairs and testing, the provision of a valve which will beso constructed that it may be readilyand positively closed is acontribution to the art of steam engineering o'tno small importance.

Particularly intestmg boilers wherethe pressure is run up to a fiftypercent overload, even with the valve in perfect cond1- tion, it isimpossible to close the valve against leakage. This defect is due to thelinesa t i 7:" Figure 2 is 2111 3111031 section, on a con; I p I.s'iderably largerscale than is shown in'Figof the globe andangle'typesineflici'ency' of the largezscrew 'threadion stem; the thrustaproducedin turning the handwheel ievenlwlth such additional torce as may beobtainedin applying wrenchesto the hand'Wh-eel is' not adequatetosecurely closethe valve against leakage, and it'otten connected andblanked oiflso'thatmy imboiler testing i,

11; have :iillustrated; my 7 improved vflvalve arove d valve is'iofspecific importance in structure in yokej'sa-f'etynon-return globe V thesame constructive section: in Figure 1,;

form 'ofbtishiligand" clampingplate. -2

I have; illustrated the valve having -the body 1 onto which is boltedthe yoke2. v "The valve body 1s of angle type having an inletusual-manner and the valve disc 61mounted onsthfeastem 'is..adapted,with the turning' down =of' the stem or "the non-rotative lowering ofthe stem as illustratedv to bear against the seat and thus close theValve;

The stein 1s packed by the insertion packing 8 which is held about thestem by the gland 9 which is adjusted by means of.

a gland nut 10. In the preferred form illustrated in Figures 1 and 2, inthe upperportion of the yoke the interiorly threaded stem bushing- 11 isslidably' mounted in. an aper- Figure 3 is a sect-ionalview of-amodified aperture 3, a n d outlet aperture 4. Thevalve i seat '5, 1s,dISPOSGCl ,u ithinjthe body-,in-ithe ture' 11 extending through theyoke and secured in n0n-rotative position by a key 12 seated in a keyWay13 in the-bushing and the inner wall ofthe yoke. I Ashoulder 14 in theaperture limits the downward movement of the bushing. I The bushing: isretained against or limited in its-upward movement by a clamping plate15 which has an extended lower portion 16 which extends "within theaperture 11 and bears against the upper, face oft-he bushing. The clamp-.ing plate may be secured to the yoke in any requires the: boiler-linesto beent-irelyjdlsv desirable manner. I have shown the clamping plateasadju'stably mounted on studs 17 on which nuts 18 are secured so thatthe clamping plate may be tightened down against the upper tacefot theyoke or loosened as desired.

In the modificatlon shown 111 Figure 3, I

have dispensed with the bushing 11 and have extended the lower portion16 of the plate so that it replaces the bushing 11 and .may be madeintegrally. This 1nodification also dispenses with the key.

The operation of securely closing the valve is accomplished as follows:The en shipped out with the nuts l8'down tight.

The nuts 18 are hacked otl' 'two turns and the handwheel is then turnedtoward the closed position enough to raise the bushing" and clampingplate, or the clamping plate,

if the modification shown in Figure 3 is employed, so that the upperface of the clamping plate bears on the bottom of nutsas shown in Figure3L1'The nuts 18 are then turned back toward their original position andthe bushing or plate carrying the valve stem non-rotatably forces thevalve 'dlsc against theseat with suflicient force to more than balancetheupward force ot'the pres sure acting on the disc. Thevalve is thenvery positively closed and leakage through itwill' be highly improbable.The operation :of fastening down the adjustment nuts.

18isgreatly facilitated if eachnut is turned a pa rtof a turn insuceessionthus avoiding binding of the clamping plate. In openingthevalve' after it has been closed, the plate is first released and thenthe handwheel used to open the valve. 1

As noted the construction of clamping device may be varied. The bushingand clamping plate may be made integrally" as shown in Figure 3. It willfurther be ob vious that cap screws or other well known types ofclai'nping devices may be employed in place of the studs with nuts, theadvantage of cap screws being that they avoid the possibility of nutsturning clear: off the studs. Having thus described my inventiomwhat Iclaim is new and desireto secure by Letters Patent, is:

1. in combination with a valve having a stem, a valve casing, a bushinghavingintornal threads, and the stem having threads engaging those ofsaid bushing, said bushing slidably mounted in the casing with clampingmembers for controlling the extent of slidablem-ovement of the bushing.7

2. In a valve having a valve closing mem her, a valve casing having aseatfor the member, a stem for controlling the. movement of the closingmember, a bushing mounted in the casing, said stem mounted forprogressive movement in threads in said bushing, said bushing slidablymounted in said casing, and a clampingmeans on said casing adapted tobear against an end of said bushing. Y

8. Incombination with a valve having a stem, a valve casing, a bushinghaving internal threads,and the stem having threads engaging those ofsaid bushing, said bushing slidably mounted in the casing-with clampingmeans for controlling the extent of slidable movement of the bushing,and a plurality of members independently operable to actuate saidclamping means.

' FRED. n; II-IEHEMANN;

